Membrane Electrode Assembly Structure for Fuel Cell Flooding Control

The electrode catalyst layer is designed with a porous structure containing fibrous materials that create capillary channels. These pores enable efficient water removal through capillary action and gas diffusion pathways, preventing water accumulation while maintaining high output operation. The porous structure allows water to be transported away from the catalyst sites where it is generated during high-power operation.

The invention applies different local properties to different regions of the electrode catalyst layer. Fibrous materials are strategically incorporated to create regions with enhanced water transport capabilities adjacent to water generation zones, while maintaining catalytic activity in other regions. This localized functional differentiation allows the layer to simultaneously handle high water generation and maintain power generation performance.

The porous structure with fibrous materials creates a three-dimensional network of interconnected channels that simultaneously facilitate both gas diffusion to the catalyst layer and water removal. The pore size distribution is optimized to allow gas molecules to reach the catalyst sites while enabling water to be transported away through larger capillary channels, thus preventing both flooding and gas supply obstruction.

The electrode catalyst layer is formulated as a composite material system combining catalytic particles, conductive materials, and fibrous water transport materials. This composite structure creates multiple functional pathways: electron conduction through the conductive matrix, gas diffusion through interstitial spaces, and water removal through fibrous capillary channels, allowing simultaneous optimization of power generation and water management without compromising gas supply.